netdev - Re: [PATCH] vdpa/mlx5: Fix wrong use of bit numbers

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Date:   Tue, 2 Mar 2021 06:24:19 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Eli Cohen <elic@...dia.com>
Cc:     Jason Wang <jasowang@...hat.com>, linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: Re: [PATCH] vdpa/mlx5: Fix wrong use of bit numbers

On Tue, Mar 02, 2021 at 07:23:06AM +0200, Eli Cohen wrote:
> On Mon, Mar 01, 2021 at 10:33:14AM -0500, Michael S. Tsirkin wrote:
> > On Mon, Mar 01, 2021 at 03:52:45PM +0800, Jason Wang wrote:
> > > 
> > > On 2021/3/1 2:28 下午, Eli Cohen wrote:
> > > > VIRTIO_F_VERSION_1 is a bit number. Use BIT_ULL() with mask
> > > > conditionals.
> > > > 
> > > > Also, in mlx5_vdpa_is_little_endian() use BIT_ULL for consistency with
> > > > the rest of the code.
> > > > 
> > > > Fixes: 1a86b377aa21 ("vdpa/mlx5: Add VDPA driver for supported mlx5 devices")
> > > > Signed-off-by: Eli Cohen <elic@...dia.com>
> > > 
> > > 
> > > Acked-by: Jason Wang <jasowang@...hat.com>
> > 
> > And CC stable I guess?
> 
> Is this a question or a request? :-)

A question. net patches are cc'd by net maintainer.

> > 
> > > 
> > > > ---
> > > >   drivers/vdpa/mlx5/net/mlx5_vnet.c | 4 ++--
> > > >   1 file changed, 2 insertions(+), 2 deletions(-)
> > > > 
> > > > diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> > > > index dc7031132fff..7d21b857a94a 100644
> > > > --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> > > > +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> > > > @@ -821,7 +821,7 @@ static int create_virtqueue(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtque
> > > >   	MLX5_SET(virtio_q, vq_ctx, event_qpn_or_msix, mvq->fwqp.mqp.qpn);
> > > >   	MLX5_SET(virtio_q, vq_ctx, queue_size, mvq->num_ent);
> > > >   	MLX5_SET(virtio_q, vq_ctx, virtio_version_1_0,
> > > > -		 !!(ndev->mvdev.actual_features & VIRTIO_F_VERSION_1));
> > > > +		 !!(ndev->mvdev.actual_features & BIT_ULL(VIRTIO_F_VERSION_1)));
> > > >   	MLX5_SET64(virtio_q, vq_ctx, desc_addr, mvq->desc_addr);
> > > >   	MLX5_SET64(virtio_q, vq_ctx, used_addr, mvq->device_addr);
> > > >   	MLX5_SET64(virtio_q, vq_ctx, available_addr, mvq->driver_addr);
> > > > @@ -1578,7 +1578,7 @@ static void teardown_virtqueues(struct mlx5_vdpa_net *ndev)
> > > >   static inline bool mlx5_vdpa_is_little_endian(struct mlx5_vdpa_dev *mvdev)
> > > >   {
> > > >   	return virtio_legacy_is_little_endian() ||
> > > > -		(mvdev->actual_features & (1ULL << VIRTIO_F_VERSION_1));
> > > > +		(mvdev->actual_features & BIT_ULL(VIRTIO_F_VERSION_1));
> > > >   }
> > > >   static __virtio16 cpu_to_mlx5vdpa16(struct mlx5_vdpa_dev *mvdev, u16 val)
> >